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Derivative of cos⁡(x)arctan⁡(x)\frac{\cos\left(x\right)}{\arctan\left(x\right)}

The derivative of cos⁡(x)arctan⁡(x)\frac{\cos\left(x\right)}{\arctan\left(x\right)} is −(sin⁡(x)arctan⁡(x))−cos⁡(x)11+x2arctan⁡(x)2\frac{-\left(\sin\left(x\right) \arctan\left(x\right)\right) - \cos\left(x\right) \frac{1}{1 + x^{2}}}{\arctan\left(x\right)^{2}}.

f(x) =
ddx[cos⁡(x)arctan⁡(x)]=−(sin⁡(x)arctan⁡(x))−cos⁡(x)11+x2arctan⁡(x)2\frac{d}{dx}\left[\frac{\cos\left(x\right)}{\arctan\left(x\right)}\right] = \frac{-\left(\sin\left(x\right) \arctan\left(x\right)\right) - \cos\left(x\right) \frac{1}{1 + x^{2}}}{\arctan\left(x\right)^{2}}

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Graph of f(x) = cos(x) / atan(x) and its derivative-3-2-1123-15-10-55slope -1.509f(x)f'(x)tangent at x = 1
Graph of f(x) = cos(x) / atan(x) and its derivative. The dashed line is the tangent at x = 1; its slope is f'(1) = -1.5093.

How to work it out

  1. 1

    We differentiate f(x)=cos⁡(x)arctan⁡(x)f(x) = \frac{\cos\left(x\right)}{\arctan\left(x\right)} with respect to x. The rule that applies is the quotient rule.

    f(x)=cos⁡(x)arctan⁡(x)f(x) = \frac{\cos\left(x\right)}{\arctan\left(x\right)}
  2. 2

    Quotient rule: (uv)′=u′v−uv′v2\left(\frac{u}{v}\right)' = \frac{u'v - uv'}{v^{2}}. Let u=cos⁡(x)u = \cos\left(x\right) and v=arctan⁡(x)v = \arctan\left(x\right).

    u=cos⁡(x),v=arctan⁡(x)u = \cos\left(x\right),\quad v = \arctan\left(x\right)
  3. 3

    Differentiate each piece:

    u′=−sin⁡(x),v′=11+x2u' = -\sin\left(x\right),\quad v' = \frac{1}{1 + x^{2}}
  4. 4

    Put them in the rule:

    f′(x)=(−sin⁡(x))(arctan⁡(x))−(cos⁡(x))(11+x2)(arctan⁡(x))2f'(x) = \frac{\left(-\sin\left(x\right)\right)\left(\arctan\left(x\right)\right) - \left(\cos\left(x\right)\right)\left(\frac{1}{1 + x^{2}}\right)}{\left(\arctan\left(x\right)\right)^{2}}
  5. 5

    Simplify:

    f′(x)=−(sin⁡(x)arctan⁡(x))−cos⁡(x)11+x2arctan⁡(x)2f'(x) = \frac{-\left(\sin\left(x\right) \arctan\left(x\right)\right) - \cos\left(x\right) \frac{1}{1 + x^{2}}}{\arctan\left(x\right)^{2}}
  6. 6

    Differentiating once more gives the second derivative, which tells you about curvature:

    f′′(x)=(−(cos⁡(x)arctan⁡(x)+sin⁡(x)11+x2)−(−(sin⁡(x)11+x2)+cos⁡(x)−(2x)(1+x2)2))arctan⁡(x)2−(−(sin⁡(x)arctan⁡(x))−cos⁡(x)11+x2)2arctan⁡(x)11+x2(arctan⁡(x)2)2f''(x) = \frac{\left(-\left(\cos\left(x\right) \arctan\left(x\right) + \sin\left(x\right) \frac{1}{1 + x^{2}}\right) - \left(-\left(\sin\left(x\right) \frac{1}{1 + x^{2}}\right) + \cos\left(x\right) \frac{-\left(2 x\right)}{\left(1 + x^{2}\right)^{2}}\right)\right) \arctan\left(x\right)^{2} - \left(-\left(\sin\left(x\right) \arctan\left(x\right)\right) - \cos\left(x\right) \frac{1}{1 + x^{2}}\right) 2 \arctan\left(x\right) \frac{1}{1 + x^{2}}}{\left(\arctan\left(x\right)^{2}\right)^{2}}
LaTeX source of the formulas on this page
\[ \frac{d}{dx}\left[\frac{\cos\left(x\right)}{\arctan\left(x\right)}\right] = \frac{-\left(\sin\left(x\right) \arctan\left(x\right)\right) - \cos\left(x\right) \frac{1}{1 + x^{2}}}{\arctan\left(x\right)^{2}} \]
\[ f(x) = \frac{\cos\left(x\right)}{\arctan\left(x\right)} \]
\[ u = \cos\left(x\right),\quad v = \arctan\left(x\right) \]
\[ u' = -\sin\left(x\right),\quad v' = \frac{1}{1 + x^{2}} \]
\[ f'(x) = \frac{\left(-\sin\left(x\right)\right)\left(\arctan\left(x\right)\right) - \left(\cos\left(x\right)\right)\left(\frac{1}{1 + x^{2}}\right)}{\left(\arctan\left(x\right)\right)^{2}} \]
\[ f'(x) = \frac{-\left(\sin\left(x\right) \arctan\left(x\right)\right) - \cos\left(x\right) \frac{1}{1 + x^{2}}}{\arctan\left(x\right)^{2}} \]
\[ f''(x) = \frac{\left(-\left(\cos\left(x\right) \arctan\left(x\right) + \sin\left(x\right) \frac{1}{1 + x^{2}}\right) - \left(-\left(\sin\left(x\right) \frac{1}{1 + x^{2}}\right) + \cos\left(x\right) \frac{-\left(2 x\right)}{\left(1 + x^{2}\right)^{2}}\right)\right) \arctan\left(x\right)^{2} - \left(-\left(\sin\left(x\right) \arctan\left(x\right)\right) - \cos\left(x\right) \frac{1}{1 + x^{2}}\right) 2 \arctan\left(x\right) \frac{1}{1 + x^{2}}}{\left(\arctan\left(x\right)^{2}\right)^{2}} \]

Values of f and f' for cos(x) / atan(x)

xf(x)f'(x)
-20.37587257-0.75339735
-1-0.68793426-1.5093467
0.51.8927792-4.2999228
10.68793426-1.5093467
2-0.37587257-0.75339735
3-0.79259905-0.049525889

Questions

What is the derivative of cos(x) / atan(x)?

The derivative of cos⁡(x)arctan⁡(x)\frac{\cos\left(x\right)}{\arctan\left(x\right)} is −(sin⁡(x)arctan⁡(x))−cos⁡(x)11+x2arctan⁡(x)2\frac{-\left(\sin\left(x\right) \arctan\left(x\right)\right) - \cos\left(x\right) \frac{1}{1 + x^{2}}}{\arctan\left(x\right)^{2}}.

What is the second derivative of cos(x) / atan(x)?

((-(cos(x) * atan(x) + sin(x) * 1 / (1 + x2x^{2})) - (-(sin(x) * 1 / (1 + x2x^{2})) + cos(x) * -(2x) / (1 + x2x^{2})^2)) * atan(x)^2 - (-(sin(x) * atan(x)) - cos(x) * 1 / (1 + x2x^{2})) * 2atan(x) * 1 / (1 + x2x^{2})) / (atan(x)^2)^2.

Which rule do you use for cos(x) / atan(x)?

The quotient rule.

What is the slope of cos(x) / atan(x) at x = 1?

-1.5093467.

Related derivatives

    Derivative of cos(x) / atan(x): (-(sin(x) * atan(x)) - cos(x) * 1 / (1 + x^2)) / atan(x)^2 (with steps) | WordGPT